feat: Simplify Content Tagging Models (openedx#33378)

* feat: Simplify tagging - remove Content*Taxonomy models
* chore: bump version of openedx-learning
* chore: fix lint errors

openedx/core/djangoapps/content_tagging/api.py

@@ -3,15 +3,15 @@
 """
 from __future__ import annotations
 
-from typing import Iterator, List, Type
+from typing import Iterator
 
 import openedx_tagging.core.tagging.api as oel_tagging
-from django.db.models import QuerySet
-from opaque_keys.edx.keys import CourseKey, UsageKey
+from django.db.models import Q, QuerySet, Exists, OuterRef
 from openedx_tagging.core.tagging.models import Taxonomy
 from organizations.models import Organization
 
-from .models import ContentObjectTag, ContentTaxonomy, TaxonomyOrg
+from .models import ContentObjectTag, TaxonomyOrg
+from .types import ContentKey
 
 
 def create_taxonomy(
@@ -21,12 +21,9 @@ def create_taxonomy(
     required=False,
     allow_multiple=False,
     allow_free_text=False,
-    taxonomy_class: Type = ContentTaxonomy,
 ) -> Taxonomy:
     """
     Creates, saves, and returns a new Taxonomy with the given attributes.
-
-    If `taxonomy_class` not provided, then uses ContentTaxonomy.
     """
     return oel_tagging.create_taxonomy(
         name=name,
@@ -35,14 +32,13 @@ def create_taxonomy(
         required=required,
         allow_multiple=allow_multiple,
         allow_free_text=allow_free_text,
-        taxonomy_class=taxonomy_class,
     )
 
 
 def set_taxonomy_orgs(
     taxonomy: Taxonomy,
     all_orgs=False,
-    orgs: List[Organization] = None,
+    orgs: list[Organization] = None,
     relationship: TaxonomyOrg.RelType = TaxonomyOrg.RelType.OWNER,
 ):
     """
@@ -81,7 +77,7 @@ def set_taxonomy_orgs(
 
 def get_taxonomies_for_org(
     enabled=True,
-    org_owner: Organization = None,
+    org_owner: Organization | None = None,
 ) -> QuerySet:
     """
     Generates a list of the enabled Taxonomies available for the given org, sorted by name.
@@ -94,32 +90,38 @@ def get_taxonomies_for_org(
     If you want the disabled Taxonomies, pass enabled=False.
     If you want all Taxonomies (both enabled and disabled), pass enabled=None.
     """
-    taxonomies = oel_tagging.get_taxonomies(enabled=enabled)
-    return ContentTaxonomy.taxonomies_for_org(
-        org=org_owner,
-        queryset=taxonomies,
+    org_short_name = org_owner.short_name if org_owner else None
+    return oel_tagging.get_taxonomies(enabled=enabled).filter(
+        Exists(
+            TaxonomyOrg.get_relationships(
+                taxonomy=OuterRef("pk"),
+                rel_type=TaxonomyOrg.RelType.OWNER,
+                org_short_name=org_short_name,
+            )
+        )
     )
 
 
 def get_content_tags(
-    object_id: str, taxonomy_id: str = None
+    object_key: ContentKey,
+    taxonomy_id: str | None = None,
 ) -> Iterator[ContentObjectTag]:
     """
     Generates a list of content tags for a given object.
 
     Pass taxonomy to limit the returned object_tags to a specific taxonomy.
     """
-    for object_tag in oel_tagging.get_object_tags(
-        object_id=object_id,
+    return oel_tagging.get_object_tags(
+        object_id=str(object_key),
         taxonomy_id=taxonomy_id,
-    ):
-        yield ContentObjectTag.cast(object_tag)
+        object_tag_class=ContentObjectTag,
+    )
 
 
 def tag_content_object(
+    object_key: ContentKey,
     taxonomy: Taxonomy,
     tags: list,
-    object_id: CourseKey | UsageKey,
 ) -> list[ContentObjectTag]:
     """
     This is the main API to use when you want to add/update/delete tags from a content object (e.g. an XBlock or
@@ -136,14 +138,18 @@ def tag_content_object(
     Raises ValueError if the proposed tags are invalid for this taxonomy.
     Preserves existing (valid) tags, adds new (valid) tags, and removes omitted (or invalid) tags.
     """
-    content_tags = []
-    for object_tag in oel_tagging.tag_object(
+    if not taxonomy.system_defined:
+        # We require that this taxonomy is linked to the content object's "org" or linked to "all orgs" (None):
+        org_short_name = object_key.org
+        if not taxonomy.taxonomyorg_set.filter(Q(org__short_name=org_short_name) | Q(org=None)).exists():
+            raise ValueError(f"The specified Taxonomy is not enabled for the content object's org ({org_short_name})")
+    oel_tagging.tag_object(
         taxonomy=taxonomy,
         tags=tags,
-        object_id=str(object_id),
-    ):
-        content_tags.append(ContentObjectTag.cast(object_tag))
-    return content_tags
+        object_id=str(object_key),
+        object_tag_class=ContentObjectTag,
+    )
+    return get_content_tags(str(object_key), taxonomy_id=taxonomy.id)
 
 
 # Expose the oel_tagging APIs

openedx/core/djangoapps/content_tagging/migrations/0002_system_defined_taxonomies.py

@@ -21,7 +21,7 @@ class Migration(migrations.Migration):
                 'indexes': [],
                 'constraints': [],
             },
-            bases=(openedx.core.djangoapps.content_tagging.models.base.ContentTaxonomyMixin, 'oel_tagging.usersystemdefinedtaxonomy'),
+            bases=('oel_tagging.usersystemdefinedtaxonomy', ),
         ),
         migrations.CreateModel(
             name='ContentLanguageTaxonomy',
@@ -32,7 +32,7 @@ class Migration(migrations.Migration):
                 'indexes': [],
                 'constraints': [],
             },
-            bases=(openedx.core.djangoapps.content_tagging.models.base.ContentTaxonomyMixin, 'oel_tagging.languagetaxonomy'),
+            bases=('oel_tagging.languagetaxonomy', ),
         ),
         migrations.CreateModel(
             name='ContentOrganizationTaxonomy',
@@ -43,7 +43,7 @@ class Migration(migrations.Migration):
                 'indexes': [],
                 'constraints': [],
             },
-            bases=(openedx.core.djangoapps.content_tagging.models.base.ContentTaxonomyMixin, 'oel_tagging.modelsystemdefinedtaxonomy'),
+            bases=('oel_tagging.modelsystemdefinedtaxonomy', ),
         ),
         migrations.CreateModel(
             name='OrganizationModelObjectTag',

openedx/core/djangoapps/content_tagging/migrations/0006_simplify_models.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.2.21 on 2023-09-29 23:32
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content_tagging', '0005_auto_20230830_1517'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='ContentAuthorTaxonomy',
+        ),
+        migrations.DeleteModel(
+            name='ContentLanguageTaxonomy',
+        ),
+        migrations.DeleteModel(
+            name='ContentTaxonomy',
+        ),
+    ]

openedx/core/djangoapps/content_tagging/models/__init__.py

@@ -4,9 +4,4 @@
 from .base import (
     TaxonomyOrg,
     ContentObjectTag,
-    ContentTaxonomy,
-)
-from .system_defined import (
-    ContentLanguageTaxonomy,
-    ContentAuthorTaxonomy,
 )

openedx/core/djangoapps/content_tagging/models/base.py

@@ -3,12 +3,12 @@
 """
 from __future__ import annotations
 
+from django.core.exceptions import ValidationError
 from django.db import models
-from django.db.models import Exists, OuterRef, Q, QuerySet
+from django.db.models import Q, QuerySet
 from django.utils.translation import gettext as _
 from opaque_keys import InvalidKeyError
-from opaque_keys.edx.keys import LearningContextKey
-from opaque_keys.edx.locator import BlockUsageLocator
+from opaque_keys.edx.keys import LearningContextKey, UsageKey
 from openedx_tagging.core.tagging.models import ObjectTag, Taxonomy
 from organizations.models import Organization
 
@@ -91,83 +91,22 @@ class Meta:
         proxy = True
 
     @property
-    def object_key(self) -> BlockUsageLocator | LearningContextKey:
+    def object_key(self) -> UsageKey | LearningContextKey:
         """
         Returns the object ID parsed as a UsageKey or LearningContextKey.
         Raises InvalidKeyError object_id cannot be parse into one of those key types.
 
         Returns None if there's no object_id.
         """
         try:
-            return LearningContextKey.from_string(str(self.object_id))
+            return LearningContextKey.from_string(self.object_id)
         except InvalidKeyError:
-            return BlockUsageLocator.from_string(str(self.object_id))
+            return UsageKey.from_string(self.object_id)
 
-
-class ContentTaxonomyMixin:
-    """
-    Taxonomy which can only tag Content objects (e.g. XBlocks or Courses) via ContentObjectTag.
-
-    Also ensures a valid TaxonomyOrg owner relationship with the content object.
-    """
-
-    @classmethod
-    def taxonomies_for_org(
-        cls,
-        queryset: QuerySet,
-        org: Organization | None = None,
-    ) -> QuerySet:
-        """
-        Filters the given QuerySet to those ContentTaxonomies which are available for the given organization.
-
-        If no `org` is provided, then only ContentTaxonomies available to all organizations are returned.
-        If `org` is provided, then ContentTaxonomies available to this organizations are also returned.
-        """
-        org_short_name = org.short_name if org else None
-        return queryset.filter(
-            Exists(
-                TaxonomyOrg.get_relationships(
-                    taxonomy=OuterRef("pk"),
-                    rel_type=TaxonomyOrg.RelType.OWNER,
-                    org_short_name=org_short_name,
-                )
-            )
-        )
-
-    def _check_object(self, object_tag: ObjectTag) -> bool:
-        """
-        Returns True if this ObjectTag has a valid object_id.
-        """
-        content_tag = ContentObjectTag.cast(object_tag)
+    def clean(self):
+        super().clean()
+        # Make sure that object_id is a valid key
         try:
-            content_tag.object_key
-        except InvalidKeyError:
-            return False
-        return super()._check_object(content_tag)
-
-    def _check_taxonomy(self, object_tag: ObjectTag) -> bool:
-        """
-        Returns True if this taxonomy is owned by the tag's org.
-        """
-        content_tag = ContentObjectTag.cast(object_tag)
-        try:
-            object_key = content_tag.object_key
-        except InvalidKeyError:
-            return False
-        if not TaxonomyOrg.get_relationships(
-            taxonomy=self,
-            rel_type=TaxonomyOrg.RelType.OWNER,
-            org_short_name=object_key.org,
-        ).exists():
-            return False
-        return super()._check_taxonomy(content_tag)
-
-
-class ContentTaxonomy(ContentTaxonomyMixin, Taxonomy):
-    """
-    Taxonomy that accepts ContentTags,
-    and ensures a valid TaxonomyOrg owner relationship with the content object.
-    """
-
-    class Meta:
-        proxy = True
+            self.object_key
+        except InvalidKeyError as err:
+            raise ValidationError("object_id is not a valid opaque key string.") from err